Setting up solver loop for 2 physics.

Hi,

I have a problem that involves EM wave (frequency around 10^14 Hz) and mechanical movement (frequency 10^6 - 10^8 Hz). Basically the EM wave will give a force on the structure, and the force depends on the current movement/bending of the structure. However, because the frequency of EM wave is much higher than that of mechanical movement, it's ok to calculate the EM wave at each time step as if the mechanical structures are static in time.

Therefore, my plan is to have a time-dependent solver for solid mechanics, and for each time step, I calculate the EM part using RF module's frequency domain solver, with moving mesh (ALE) connecting the solid mechanics and EM parts. I then have an expression that will calculate force from EM field configuration and use it as the load in solid mechanics for the next time step.

My question is how do I set up the solver as described above. How can I have the frequency domain solver at each time step of the time-dependent solver?

Thank you in advanced. My version is 4.0. I wouldn't mind if I really have to use livelink to Matlab or something along that line.